BACKGROUND:Seen as traitors in the Koopa Kingdom, Mario used them to pelt the Koopa Clown Car.
Mecha Koopas are quite nasty as they will collapse after being jumped on, but will
reboot after a few moments, in Mario's hands! Bowser destroyed the traitorous Mecha
Koopas and had his best Shy Guys working on a new version (Mecha Koopa 2.0) which
was gigantic and could warp to Bowser's location. Bowser used this model as a
weapon when he teamed up with Mario to stop Smithy's invasion of the Mushroom
World.
Finally, the Koopa Troop developed Mecha Koopa 3.0, which was smaller and faster.
These ones had the additional weapon of a Bowser themed flamethrower! However,
the main downfall was that the Mecha Koopa 3.0 was so small that it was easily
stompable and it was also unable to keep going for longer than a minute. Since
then, Bowser hasn't bothered making any more.